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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust Components
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<blockquote data-quote="BigEd" data-source="post: 38169" data-attributes="member: 161"><p>Way back when I was AC-U noise meter operator at Vintage meetings we often called riders randomly down to the scrutineering area for a noise test. Roger Moss with his very rapid Scott two-stroke twin always passed easily. At one Oulton Park meeting Roger's number came out of the hat and I decided to go and find Roger and do the test where he was parked in the paddock. I watched Roger fire up the Scott and did the test. The noise from the short stub pipes traditionally run by Scott racers sent the meter way off the scale! (This at a time when the limit, I think, was 115 Db.) Roger being the gentleman that he is just said OK and put the bike back on his trailer. </p><p>How had it managed to pass the noise test before? Years later Roger told me the secret. When he was called down for a noise test he always pushed it to the test area with the engine already running having already started it in the paddock by pushing it in reverse. The two-stroke was quite happy to run backwards and ran much more quietly when doing so.</p><p>Roger had the last laugh as this episode lead him to fit an expansion chamber exhaust system that was not only quieter but made the Scott even more rapid!<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="BigEd, post: 38169, member: 161"] Way back when I was AC-U noise meter operator at Vintage meetings we often called riders randomly down to the scrutineering area for a noise test. Roger Moss with his very rapid Scott two-stroke twin always passed easily. At one Oulton Park meeting Roger's number came out of the hat and I decided to go and find Roger and do the test where he was parked in the paddock. I watched Roger fire up the Scott and did the test. The noise from the short stub pipes traditionally run by Scott racers sent the meter way off the scale! (This at a time when the limit, I think, was 115 Db.) Roger being the gentleman that he is just said OK and put the bike back on his trailer. How had it managed to pass the noise test before? Years later Roger told me the secret. When he was called down for a noise test he always pushed it to the test area with the engine already running having already started it in the paddock by pushing it in reverse. The two-stroke was quite happy to run backwards and ran much more quietly when doing so. Roger had the last laugh as this episode lead him to fit an expansion chamber exhaust system that was not only quieter but made the Scott even more rapid!:) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Exhaust Components
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